a month ago and now h seems to be doing it within a matter of days. that concerns us. >> reporter: in each case the robber brandishes a knife, grabs cash from the register, and runs away. >> establishments seem to be centered around route 28. so anyone who shops or does business on route 28, we ask you to keep your eyes and ears open. call us if you see anything unusual. >> reporter: so far no one has been injuredn any of these robberies but police are concerned that the suspect could become violent. if you have any information or recognize the person in the surveillan video, you're asked to call police in loudoun or fairfax county. in ashburn, darcy spencer, news 4. >>> after almost five months there appears to an end in sight with bp's blownout oil well. we're taking a look. crews are pumping in cement to seal the well from the bought a.m. and officials say that has hardened just fine. pressure and weight test is all that's needed to be sure it's permanently closed. an announcement is expected to come today. >> the picture from underwater hasn't always been perfect but it's been interes